* Add Korean Day of Month with ordinal ([#2395](https://github.com/iamkun/dayjs/issues/2395)) ([dd55ee2](https://github.com/iamkun/dayjs/commit/dd55ee2aadd1009242235e47d558bbf028827896))
* change back fa locale to the Gregorian calendar equivalent ([#2411](https://github.com/iamkun/dayjs/issues/2411)) ([95e9458](https://github.com/iamkun/dayjs/commit/95e9458b221fe35e59ee4a160a5db247313a68fb))
* duration plugin getter get result 0 instead of undefined ([#2369](https://github.com/iamkun/dayjs/issues/2369)) ([061aa7e](https://github.com/iamkun/dayjs/commit/061aa7ed6c31696974665fc9b11a74d30841ebed))
* fix timezone plugin to get correct locale setting ([#2420](https://github.com/iamkun/dayjs/issues/2420)) ([4f45012](https://github.com/iamkun/dayjs/commit/4f4501256fa1bc72128aae1d841bbd782df86aed))
* **locale:** add meridiem in `ar` locale ([#2418](https://github.com/iamkun/dayjs/issues/2418)) ([361be5c](https://github.com/iamkun/dayjs/commit/361be5c7c628614ee833d710acbe154a598b904d))
* round durations to millisecond precision for ISO string ([#2367](https://github.com/iamkun/dayjs/issues/2367)) ([890a17a](https://github.com/iamkun/dayjs/commit/890a17a8d8ddd43c7c8b806e3afc7b27f3288d27))
* sub-second precisions need to be rounded at the seconds field to avoid adding floats ([#2377](https://github.com/iamkun/dayjs/issues/2377)) ([a9d7d03](https://github.com/iamkun/dayjs/commit/a9d7d0398d22ebd4bfc3812ca0134a97606d54d9))
* update $x logic to avoid plugin error ([#2429](https://github.com/iamkun/dayjs/issues/2429)) ([2254635](https://github.com/iamkun/dayjs/commit/22546357f30924fcff3b3ffa14fd04be21f97a5e))
* Update Slovenian locale for relative time ([#2396](https://github.com/iamkun/dayjs/issues/2396)) ([5470a15](https://github.com/iamkun/dayjs/commit/5470a15e437fac803797363063b24f3ba3bd5299))
* update uzbek language translation ([#2327](https://github.com/iamkun/dayjs/issues/2327)) ([0a91056](https://github.com/iamkun/dayjs/commit/0a910564d76dc7c128da8e0d85d8e11ebdb5660b))
* Add null to min and max plugin return type ([#2355](https://github.com/iamkun/dayjs/issues/2355)) ([62d9042](https://github.com/iamkun/dayjs/commit/62d9042eb84b78d78324694ccbeaad1679d37e68))
* check if null passed to objectSupport parser ([#2175](https://github.com/iamkun/dayjs/issues/2175)) ([013968f](https://github.com/iamkun/dayjs/commit/013968f609c32e2269df69b4dd1feb2e8e1e035a))
* dayjs(null) throws error, not return dayjs object as invalid date ([#2334](https://github.com/iamkun/dayjs/issues/2334)) ([c79e2f5](https://github.com/iamkun/dayjs/commit/c79e2f5d03eef5660b1f13385b69c0c9668d2f98))
* objectSupport plugin causes an error when null is passed to dayjs function (closes [#2277](https://github.com/iamkun/dayjs/issues/2277)) ([#2342](https://github.com/iamkun/dayjs/issues/2342)) ([89bf31c](https://github.com/iamkun/dayjs/commit/89bf31ce0a36dcfc892029dc019d85d3654cf5fb))
* Optimize format method ([#2313](https://github.com/iamkun/dayjs/issues/2313)) ([1fe1b1d](https://github.com/iamkun/dayjs/commit/1fe1b1d9a214d3b8c9f267b432801424a493f1c4))
* update Duration plugin add/subtract take into account days in month ([#2337](https://github.com/iamkun/dayjs/issues/2337)) ([3b1060f](https://github.com/iamkun/dayjs/commit/3b1060f92183ab3a3c49289c2d87fbdd34c1eacc))
* update MinMax plugin 1. ignore the 'null' in args 2. return the only one arg ([#2330](https://github.com/iamkun/dayjs/issues/2330)) ([3c2c6ee](https://github.com/iamkun/dayjs/commit/3c2c6ee4db00bbb43a7a3bb0b56bc0d0f03daddc))
* .format add padding to 'YYYY' ([#2231](https://github.com/iamkun/dayjs/issues/2231)) ([00c223b](https://github.com/iamkun/dayjs/commit/00c223b7e92970d07557133994fcb225a6d4c960))
* Added .valueOf method to Duration class ([#2226](https://github.com/iamkun/dayjs/issues/2226)) ([9b4fcfd](https://github.com/iamkun/dayjs/commit/9b4fcfde35b39693894be1821b6c7222fac98657))
* timezone type mark `date` parameter as optional ([#2222](https://github.com/iamkun/dayjs/issues/2222)) ([b87aa0e](https://github.com/iamkun/dayjs/commit/b87aa0ed9a748c478a66ef48230cd1d6350d7b8a))
* type file first parameter date is optional in isSame(), isBefore(), isAfter() ([#2272](https://github.com/iamkun/dayjs/issues/2272)) ([4d56f3e](https://github.com/iamkun/dayjs/commit/4d56f3eb2b3770879d60f824590bf1b32f237d47))
* ordinal for nl not working ([#2011](https://github.com/iamkun/dayjs/issues/2011)) ([c93c85e](https://github.com/iamkun/dayjs/commit/c93c85eaa11564a1aae2d823480a417812c01bf4))
* wrong ordinal for french locale ([#2010](https://github.com/iamkun/dayjs/issues/2010)) ([dd192a7](https://github.com/iamkun/dayjs/commit/dd192a72fc5d26ce56481e89b0c1ccf5f939be0c))
* correct past property in ku (kurdish) locale ([#1916](https://github.com/iamkun/dayjs/issues/1916)) ([74e82b9](https://github.com/iamkun/dayjs/commit/74e82b9da5ec8b90361fc27ac7c8b63faf354502))
* fix French [fr] local ordinal ([#1932](https://github.com/iamkun/dayjs/issues/1932)) ([8f09834](https://github.com/iamkun/dayjs/commit/8f09834a88b8e7f8353c6e7473d4711596890a8c))
* fix objectSupport plugin ConfigTypeMap type ([#1441](https://github.com/iamkun/dayjs/issues/1441)) ([#1990](https://github.com/iamkun/dayjs/issues/1990)) ([fd51fe4](https://github.com/iamkun/dayjs/commit/fd51fe4f7fa799d8c598343e71fa59299ec4cf93))
* fix type error to add ordianl property in InstanceLocaleDataReturn and GlobalLocaleDataReturn types ([#1931](https://github.com/iamkun/dayjs/issues/1931)) ([526f0ae](https://github.com/iamkun/dayjs/commit/526f0ae549ffbeeb9ef1099ca23964791fc59743))
* update locale ar-* meridiem function ([#1954](https://github.com/iamkun/dayjs/issues/1954)) ([3d31611](https://github.com/iamkun/dayjs/commit/3d316117f04362d31f4e8bd349620b8414ce5d0c))
* customParseFormat plugin to parse comma as a separator character ([#1913](https://github.com/iamkun/dayjs/issues/1913)) ([41b1405](https://github.com/iamkun/dayjs/commit/41b1405971e099431211ae6c2a100cd797da4427))
* add OpUnitType (week) to quarterOfYear startOf/endOf types ([#1865](https://github.com/iamkun/dayjs/issues/1865)) ([400bc3e](https://github.com/iamkun/dayjs/commit/400bc3e8915e0c58e7abbfd3a1235364b1abaf3e))
* Fix type issue with ManipulateType ([#1864](https://github.com/iamkun/dayjs/issues/1864)) ([d033dfc](https://github.com/iamkun/dayjs/commit/d033dfcfc1d2ced39b2733898e8d85ad5984c9e9))
* fix UTC plugin .valueOf not taking DST into account ([#1448](https://github.com/iamkun/dayjs/issues/1448)) ([27d1c50](https://github.com/iamkun/dayjs/commit/27d1c506100ae6624f258c21cc06b24768ced733))
* Update German [de] locale, adds the abbreviations for month including a . in the end, as in September -> Sept. ([#1831](https://github.com/iamkun/dayjs/issues/1831)) ([4e2802c](https://github.com/iamkun/dayjs/commit/4e2802cc3bec2941ffb737a15fb531c90951eafe))
* update Italian (Switzerland) [it-ch] locale relativeTime ([#1829](https://github.com/iamkun/dayjs/issues/1829)) ([8e6d11d](https://github.com/iamkun/dayjs/commit/8e6d11d053393d97bee1ba411adb2d82de1a58c4))
* update locale bo [Tibetan]: corrected the orders in formats ([#1823](https://github.com/iamkun/dayjs/issues/1823)) ([e790516](https://github.com/iamkun/dayjs/commit/e79051617af6787358f6c9b5443d987b8b53a9e1))
* add missing date shorthand D type definition ([#1752](https://github.com/iamkun/dayjs/issues/1752)) ([b045baf](https://github.com/iamkun/dayjs/commit/b045baf1646a81f7e4f446f355d02d5fb0ef4aa7))
* Add relative time to Galician (gl) and fix ordinals ([#1800](https://github.com/iamkun/dayjs/issues/1800)) ([dcbf170](https://github.com/iamkun/dayjs/commit/dcbf1708400624addfbddbc71e0f6a9ac15fa961))
* update German locales (de-at, de-ch) ([#1775](https://github.com/iamkun/dayjs/issues/1775)) ([f9055a7](https://github.com/iamkun/dayjs/commit/f9055a77bf3d84c575e5fcf99e21611138ba64d7))
* Update locale German [de] monthsShort ([#1746](https://github.com/iamkun/dayjs/issues/1746)) ([4a7b7d0](https://github.com/iamkun/dayjs/commit/4a7b7d07c885bb9338514c234dbb708e24e9863e))
* update meridiem function to Kurdish (ku) locale ([#1725](https://github.com/iamkun/dayjs/issues/1725)) ([efd3904](https://github.com/iamkun/dayjs/commit/efd3904ff8cbf0a4fc064911dda76fc86b669f7b))
* Fallback to language only locale + support uppercase locales ([#1524](https://github.com/iamkun/dayjs/issues/1524)) ([9138dc2](https://github.com/iamkun/dayjs/commit/9138dc28206875372da4fb74c64716437cd11b95))
* add format object type to type file ([#1572](https://github.com/iamkun/dayjs/issues/1572)) ([5a79cc6](https://github.com/iamkun/dayjs/commit/5a79cc6408e825d9e123629eb44fc19c996d7751))
* duration plugin when parsing duration from ISO string, set missing components to 0 instead of NaN ([#1611](https://github.com/iamkun/dayjs/issues/1611)) ([252585b](https://github.com/iamkun/dayjs/commit/252585b4b2bd59508150e21bb994908a9d78f9b0))
* narrow type for `add` and `subtract` ([#1576](https://github.com/iamkun/dayjs/issues/1576)) ([1686962](https://github.com/iamkun/dayjs/commit/16869621b1a42563064dbf87f80c1ebfd74c1188))
* update customParseFormat plugin strict x X parsing ([#1571](https://github.com/iamkun/dayjs/issues/1571)) ([08adda5](https://github.com/iamkun/dayjs/commit/08adda54edbcca38601f57841921d0f87f84e49e))
* update Lithuanian [lt] locale spelling for single month ([#1609](https://github.com/iamkun/dayjs/issues/1609)) ([255dc54](https://github.com/iamkun/dayjs/commit/255dc54d9295de135a9037ce6ca13cae4bfd2cfb))
* Update Norwegian Bokmål [nb] local yearStart 4 ([#1608](https://github.com/iamkun/dayjs/issues/1608)) ([7a8467c](https://github.com/iamkun/dayjs/commit/7a8467c0b7d59821f7e19d4a6973bcda8e4c19b1))
* add invalid date string override ([#1465](https://github.com/iamkun/dayjs/issues/1465)) ([#1470](https://github.com/iamkun/dayjs/issues/1470)) ([06f88f4](https://github.com/iamkun/dayjs/commit/06f88f425828b1ce96b737332d25145a95a4ee9d))
* add sv-fi Finland Swedish locale ([#1522](https://github.com/iamkun/dayjs/issues/1522)) ([8e32164](https://github.com/iamkun/dayjs/commit/8e32164855cff724642e24c37a631eb4c4d760c8))
* customParseFormat support parsing X x timestamp ([#1567](https://github.com/iamkun/dayjs/issues/1567)) ([eb087f5](https://github.com/iamkun/dayjs/commit/eb087f52861313b8dd8a5c1b77858665ec72859e))
* Fix DayOfYear plugin when using BadMutable plugin ([#1511](https://github.com/iamkun/dayjs/issues/1511)) ([0b0c6a3](https://github.com/iamkun/dayjs/commit/0b0c6a31ec9c0aff991b0e8dd6eed116201274cc))
* Implement ordinal in Bulgarian translation (fixes [#1501](https://github.com/iamkun/dayjs/issues/1501)) ([#1502](https://github.com/iamkun/dayjs/issues/1502)) ([b728da5](https://github.com/iamkun/dayjs/commit/b728da5ed9ed08210004ed20ce5fcd52a92de7da))
* more strict delimiter in REGEX_PARSE ([#1555](https://github.com/iamkun/dayjs/issues/1555)) ([bfdab5c](https://github.com/iamkun/dayjs/commit/bfdab5c0d45a5736b68e8e1b1354fc021e05f607))
* parameter type ([#1549](https://github.com/iamkun/dayjs/issues/1549)) ([f369844](https://github.com/iamkun/dayjs/commit/f369844dd69d253c4c7cbf68150939db3db233be))
* update customParseFormat plugin to custom two-digit year parse function ([#1421](https://github.com/iamkun/dayjs/issues/1421)) ([bb5df55](https://github.com/iamkun/dayjs/commit/bb5df55cd3975dc7638b8f4e762afa470b6620f7))
* update names of weekdays and months in Bulgarian [bg] to lowercase ([#1438](https://github.com/iamkun/dayjs/issues/1438)) ([b246210](https://github.com/iamkun/dayjs/commit/b24621091fec9cf6704de21e4b323f6f0c4abbf1))
* update type file `.diff` ([#1505](https://github.com/iamkun/dayjs/issues/1505)) ([6508494](https://github.com/iamkun/dayjs/commit/6508494a4e62977b4397baaeef293d1bcf3c7235))
* update UTC plugin type file for strict parsing ([#1443](https://github.com/iamkun/dayjs/issues/1443)) ([b4f28df](https://github.com/iamkun/dayjs/commit/b4f28df219fe63202dffdbeeaec5677c4d2c9111))
* add meridiem in ar locales ([#1375](https://github.com/iamkun/dayjs/issues/1375)) ([319f616](https://github.com/iamkun/dayjs/commit/319f616e572a03b984013d04d1b3a18ffd5b1190))
* Added Zulu support to customParseFormat ([#1359](https://github.com/iamkun/dayjs/issues/1359)) ([1138a3f](https://github.com/iamkun/dayjs/commit/1138a3f0a76592c6d72fb86c4399e133fa41e2ec))
* Update duration plugin change string to number ([#1394](https://github.com/iamkun/dayjs/issues/1394)) ([e1546d1](https://github.com/iamkun/dayjs/commit/e1546d1a0cdb97ae92cf11efe61d94707af6a3a3))
* update Duration plugin to support no-argument ([#1400](https://github.com/iamkun/dayjs/issues/1400)) ([8d9a5ae](https://github.com/iamkun/dayjs/commit/8d9a5ae0749e1b4e76babd4deeaa3b1d9776c29b))
* Update Finnish [fi] locale to set yearStart ([#1378](https://github.com/iamkun/dayjs/issues/1378)) ([f3370bd](https://github.com/iamkun/dayjs/commit/f3370bda4e435118f714c8a7daf5c88cfc4b69ba))
* update Russian [ru] locale meridiem and unit tests ([#1403](https://github.com/iamkun/dayjs/issues/1403)) ([f10f39d](https://github.com/iamkun/dayjs/commit/f10f39de7db70244a3c35e4a421090a12972457b))
* update Slovenian [sl] locale to set correct ordinal ([#1386](https://github.com/iamkun/dayjs/issues/1386)) ([cb4f746](https://github.com/iamkun/dayjs/commit/cb4f74633b3020d6dbf19548c8cb13613dafca18))
* update Spanish [es] locale to change month names to lowercase ([#1414](https://github.com/iamkun/dayjs/issues/1414)) ([9c20e77](https://github.com/iamkun/dayjs/commit/9c20e77caf7b1b5eccf418175203b198d4e29535))
* update Swedish [sv] locale to set correct yearStart ([#1385](https://github.com/iamkun/dayjs/issues/1385)) ([66c5935](https://github.com/iamkun/dayjs/commit/66c59354964ef456bcd5f6152819618f44978082))
* update UTC plugin to support string argument like +HH:mm ([#1395](https://github.com/iamkun/dayjs/issues/1395)) ([656127c](https://github.com/iamkun/dayjs/commit/656127cc44eda50923a1ac755602863fc32b9e69))
* parse a string for MMM month format with underscore delimiter ([#1349](https://github.com/iamkun/dayjs/issues/1349)) ([82ef9a3](https://github.com/iamkun/dayjs/commit/82ef9a304f06287ac0a14c4da9a7fe6152b5fec9))
* update advancedFormat plugin to add format options for iso week and weekyear ([#1309](https://github.com/iamkun/dayjs/issues/1309)) ([2c54c64](https://github.com/iamkun/dayjs/commit/2c54c6441871a175ac9b95e41e4cd075dbac10cb))
* update devHelper to add dev warning setting locale before loading ([c5cc893](https://github.com/iamkun/dayjs/commit/c5cc89355e1e206ca72433c19c40cb528690b04f))
* update German [de] locale yearStart ([1858df8](https://github.com/iamkun/dayjs/commit/1858df8008de56570680723df89b36a8cbc970ef)), closes [#1264](https://github.com/iamkun/dayjs/issues/1264)
* remove module entry in package.json to revert 1.10.1 change ([#1314](https://github.com/iamkun/dayjs/issues/1314)) ([824dcb8](https://github.com/iamkun/dayjs/commit/824dcb8dfcccf14f64b6a2741a00fcdfe53dcd98))
* update devHelper add warning "passing Year as a Number will be parsed as a Unix timestamp" ([#1315](https://github.com/iamkun/dayjs/issues/1315)) ([b0dda31](https://github.com/iamkun/dayjs/commit/b0dda3139e25441ab4e7c1f4f192dee0ecce6ef8))
* add type support for plural forms of units ([#1289](https://github.com/iamkun/dayjs/issues/1289)) ([de49bb1](https://github.com/iamkun/dayjs/commit/de49bb100badfb92b9a5933cc568841f340a923f))
* escape last period to match only milliseconds ([#1239](https://github.com/iamkun/dayjs/issues/1239)) ([#1295](https://github.com/iamkun/dayjs/issues/1295)) ([64037e6](https://github.com/iamkun/dayjs/commit/64037e6a8cf303dcfd2b954f309bd9691f87fffc))
### Features
* add ES6 Module Support, package.json module point to "esm/index.js" ([#1298](https://github.com/iamkun/dayjs/issues/1298)) ([f63375d](https://github.com/iamkun/dayjs/commit/f63375dea89becbd3bb2bb8ea7289c58c752bfed)), closes [#598](https://github.com/iamkun/dayjs/issues/598) [#313](https://github.com/iamkun/dayjs/issues/313)
* update Hebrew [he] locale for double units ([#1287](https://github.com/iamkun/dayjs/issues/1287)) ([1c4b0da](https://github.com/iamkun/dayjs/commit/1c4b0da1468522e59dc9ee646d10dd2b31477d99))
* update zh locale meridiem "noon" ([0e7ff3d](https://github.com/iamkun/dayjs/commit/0e7ff3dd29ca3aed85cb76dfcb8298d326e26542))
* update zh-cn locale definition of noon ([#1278](https://github.com/iamkun/dayjs/issues/1278)) ([d5930b9](https://github.com/iamkun/dayjs/commit/d5930b96ff884f4176ca3fcb1bc95e8f1ec75c71))
* add duration.format to format a Duration ([#1202](https://github.com/iamkun/dayjs/issues/1202)) ([9a859a1](https://github.com/iamkun/dayjs/commit/9a859a147ba223a1eeff0f2bb6f33d97e0ccc6c7))
* Add function handling for relativeTime.future and relativeTime.past ([#1197](https://github.com/iamkun/dayjs/issues/1197)) ([ef1979c](https://github.com/iamkun/dayjs/commit/ef1979ce85c61fe2d759ef3c37cb6aaf2358094f))
* avoid memory leak after installing a plugin too many times ([b8d2e32](https://github.com/iamkun/dayjs/commit/b8d2e32a9eb59661a7ed6200daa070687becaebd))
* fix diff bug when UTC plugin enabled ([#1201](https://github.com/iamkun/dayjs/issues/1201)) ([9544ed2](https://github.com/iamkun/dayjs/commit/9544ed2a6c466b8308d26b33a388a6737435a1f4)), closes [#1200](https://github.com/iamkun/dayjs/issues/1200)
* fix startOf/endOf bug in timezone plugin ([#1229](https://github.com/iamkun/dayjs/issues/1229)) ([eb5fbc4](https://github.com/iamkun/dayjs/commit/eb5fbc4c7d1b62a8615d2f263b404a9515d8e15c))
* fix utc plugin diff edge case ([#1187](https://github.com/iamkun/dayjs/issues/1187)) ([971b3d4](https://github.com/iamkun/dayjs/commit/971b3d40b4c9403165138f1034e2223cd97c3abf))
* fix devHelper error in umd bundle in browser ([#1165](https://github.com/iamkun/dayjs/issues/1165)) ([d11b5ee](https://github.com/iamkun/dayjs/commit/d11b5ee7dc11af671355f65ccda00f6ba42cc725))
* fix utc plugin diff bug in DST ([#1171](https://github.com/iamkun/dayjs/issues/1171)) ([f8da3fe](https://github.com/iamkun/dayjs/commit/f8da3fe7e50c84c0502bf5be0b364910922dbd79)), closes [#1097](https://github.com/iamkun/dayjs/issues/1097) [#1021](https://github.com/iamkun/dayjs/issues/1021)
* isoWeek plugin type ([#1177](https://github.com/iamkun/dayjs/issues/1177)) ([c3d0436](https://github.com/iamkun/dayjs/commit/c3d0436b06f74989e3a2c751a5d170f8072c4aad))
* update localeData plugin to support meridiem ([#1174](https://github.com/iamkun/dayjs/issues/1174)) ([fdb09e4](https://github.com/iamkun/dayjs/commit/fdb09e4074cc7e8f6196846f18d3566c1f9e8fcd)), closes [#1172](https://github.com/iamkun/dayjs/issues/1172)
* update timezone plugin parse Date instance / timestamp logic & remove useless test ([#1183](https://github.com/iamkun/dayjs/issues/1183)) ([a7f858b](https://github.com/iamkun/dayjs/commit/a7f858bb70ad81f718ba35c479e84b54eace48b2))
* update adding/subtracting Duration from Dayjs object ([#1156](https://github.com/iamkun/dayjs/issues/1156)) ([f861aca](https://github.com/iamkun/dayjs/commit/f861acac3e83e28d3a4a96312c71119fd6b544fc))
* update en-NZ locale to use proper ordinal formatting function ([#1143](https://github.com/iamkun/dayjs/issues/1143)) ([fcdbc58](https://github.com/iamkun/dayjs/commit/fcdbc5880710456a29b2bacf250542230bf48b99))
* update localeData plugin type ([#1116](https://github.com/iamkun/dayjs/issues/1116)) ([ee5a4ec](https://github.com/iamkun/dayjs/commit/ee5a4ec41edddfb57d103c35182dc635c9264a10))
* update timezone plugin to support custom parse format ([#1160](https://github.com/iamkun/dayjs/issues/1160)) ([48cbf31](https://github.com/iamkun/dayjs/commit/48cbf3118ba5427de428777c2e025896db654f2e)), closes [#1159](https://github.com/iamkun/dayjs/issues/1159)
* update timezone plugin to support keepLocalTime ([#1161](https://github.com/iamkun/dayjs/issues/1161)) ([1d429e5](https://github.com/iamkun/dayjs/commit/1d429e5fe4467ebddcf81b43cf6f36e5e3be944c)), closes [#1149](https://github.com/iamkun/dayjs/issues/1149)
* export type of duration plugin ([#1094](https://github.com/iamkun/dayjs/issues/1094)) ([2c92e71](https://github.com/iamkun/dayjs/commit/2c92e71bf55d09601120cdf433da7a19cc8abff6))
* Fix objectSupport plugin bug in UTC ([#1107](https://github.com/iamkun/dayjs/issues/1107)) ([fe90bb6](https://github.com/iamkun/dayjs/commit/fe90bb6944f2ff1969ca975954d303b449dfa95b)), closes [#1105](https://github.com/iamkun/dayjs/issues/1105)
* fix Serbian locale grammar (sr, sr-cyrl) ([#1108](https://github.com/iamkun/dayjs/issues/1108)) ([cc87eff](https://github.com/iamkun/dayjs/commit/cc87eff8b75b0d86ce0956516319d402bccae6c0))
* Fix typo for "monday" in arabic ([#1067](https://github.com/iamkun/dayjs/issues/1067)) ([2e1e426](https://github.com/iamkun/dayjs/commit/2e1e42650124f30282dc4d710798d576b928f1c7))
* support dayjs.add(Duration), dayjs.subtract(Duration) ([#1099](https://github.com/iamkun/dayjs/issues/1099)) ([b1a0294](https://github.com/iamkun/dayjs/commit/b1a02942c5238203aaa04ce9a074c73742324ab7))
* update German [de] locale relativeTime config ([#1109](https://github.com/iamkun/dayjs/issues/1109)) ([f6e771b](https://github.com/iamkun/dayjs/commit/f6e771b70f93d19ebb12e6b794aa4628a1796248))
* update localeData plugin to add longDateFormat to global localeData ([#1106](https://github.com/iamkun/dayjs/issues/1106)) ([16937d1](https://github.com/iamkun/dayjs/commit/16937d16e053b8c1d4a607622fa2fdbfd9809832))
* Update objectSupport plugin to return current date time while parsing empty object ([f56783e](https://github.com/iamkun/dayjs/commit/f56783e14d8cf50916b015e7188b23bb6fbca839))
* Fix objectSupport plugin to get the correct result (zero-based month) ([#1089](https://github.com/iamkun/dayjs/issues/1089)) ([f95ac15](https://github.com/iamkun/dayjs/commit/f95ac15a4577ae5a3d1ce353872a2cd9fc454bc2))
* Add `setDefault` typing to timezone.d.ts ([#1057](https://github.com/iamkun/dayjs/issues/1057)) ([c0f0886](https://github.com/iamkun/dayjs/commit/c0f088620f17260e6e3ebce7697d561b5623f5f3))
* fix DST bug in utc plugin ([#1053](https://github.com/iamkun/dayjs/issues/1053)) ([3d73543](https://github.com/iamkun/dayjs/commit/3d7354361f042ced1176d91f9ae9edffe6173425))
* Fix optional type for timezone plugin ([#1081](https://github.com/iamkun/dayjs/issues/1081)) ([a6ebcf2](https://github.com/iamkun/dayjs/commit/a6ebcf283a83273562dce5663155e3b3a12ea9a5)), closes [#1079](https://github.com/iamkun/dayjs/issues/1079)
* update duration plugin type file ([#1065](https://github.com/iamkun/dayjs/issues/1065)) ([94af9af](https://github.com/iamkun/dayjs/commit/94af9af27c5bc182cbb24f1845e561dd1d82d776))
* update timezone plugin to support getting offset name e.g. EST ([#1069](https://github.com/iamkun/dayjs/issues/1069)) ([cbb755e](https://github.com/iamkun/dayjs/commit/cbb755e5c68d49c5678291f3ce832b32831a056e))
* update utc plugin to support keepLocalTime `.utc(true)` ([#1080](https://github.com/iamkun/dayjs/issues/1080)) ([5ce4e0d](https://github.com/iamkun/dayjs/commit/5ce4e0d2f552f3645262537ff7afdc946f5a7e72))
### Features
* Correct casing for en-sg locale name ([#1048](https://github.com/iamkun/dayjs/issues/1048)) ([2edaddc](https://github.com/iamkun/dayjs/commit/2edaddc22a7eb914f915531f389766217acd7034))
* Export Duration type in duration plugin ([#1043](https://github.com/iamkun/dayjs/issues/1043)) ([0f20c3a](https://github.com/iamkun/dayjs/commit/0f20c3ac75d9ac1026a15a7bb343d3a150d9b30f))
* Timezone plugin set default timezone ([#1033](https://github.com/iamkun/dayjs/issues/1033)) ([0c2050a](https://github.com/iamkun/dayjs/commit/0c2050a152da708b01edd6150a5013f642b14576))
* Timezone plugin should have the same behavior in latest ICU version ([#1032](https://github.com/iamkun/dayjs/issues/1032)) ([de31592](https://github.com/iamkun/dayjs/commit/de315921575cc50c38464b27d0338e30a54d8e2a))
* Fix BadMutable plugin bug in .diff ([#1023](https://github.com/iamkun/dayjs/issues/1023)) ([40ab6d9](https://github.com/iamkun/dayjs/commit/40ab6d9a53e8047cfca63c611c25dd045372d021))
* fix LocaleData plugin to support instance.weekdays() API ([#1019](https://github.com/iamkun/dayjs/issues/1019)) ([a09d259](https://github.com/iamkun/dayjs/commit/a09d259a407b81d1cb6bb5623fad551c775d8674)), closes [#1017](https://github.com/iamkun/dayjs/issues/1017)
* Update Dutch (nl) locale to set correct yearStart ([1533a2c](https://github.com/iamkun/dayjs/commit/1533a2cc1475270032da2d87b19fc3d62327e6e3))
* Fix Timezone plugin to preserve milliseconds while changing timezone ([#1003](https://github.com/iamkun/dayjs/issues/1003)) ([5f446ed](https://github.com/iamkun/dayjs/commit/5f446eda770fa97e895c81a8195b3ba5d082cef0)), closes [#1002](https://github.com/iamkun/dayjs/issues/1002)
* support parsing unlimited decimals of millisecond ([#1010](https://github.com/iamkun/dayjs/issues/1010)) ([d1bdd36](https://github.com/iamkun/dayjs/commit/d1bdd36a56e3d1786523a180e3fc18068f609135)), closes [#544](https://github.com/iamkun/dayjs/issues/544)
* update Duration plugin to support global locale ([#1008](https://github.com/iamkun/dayjs/issues/1008)) ([1c49c83](https://github.com/iamkun/dayjs/commit/1c49c83e79811eede13db6372b5d65db598aee77)), closes [#1007](https://github.com/iamkun/dayjs/issues/1007)
* Add PluralGetSet plugin for plural getters/setters ([#996](https://github.com/iamkun/dayjs/issues/996)) ([f76e3ce](https://github.com/iamkun/dayjs/commit/f76e3ce2fbe5d3e9ed9121086baf55eb0cc4d355))
* Add typescript type defs in esm build ([#985](https://github.com/iamkun/dayjs/issues/985)) ([50e3b3c](https://github.com/iamkun/dayjs/commit/50e3b3c6719cb0b4ec6eff394dacd63d5db8f253))
* Fix isoWeek Plugin cal bug in UTC mode ([#993](https://github.com/iamkun/dayjs/issues/993)) ([f2e5f32](https://github.com/iamkun/dayjs/commit/f2e5f327aaf12b4572296ec6e107ecc05fcf76e7))
* Fix UTC plugin bug while comparing an utc instance to a local one ([#995](https://github.com/iamkun/dayjs/issues/995)) ([747c0fb](https://github.com/iamkun/dayjs/commit/747c0fb4eba6353755b5dad3417fd8d5a408c378))
* fix parse date string error e.g. '2020/9/30' ([#980](https://github.com/iamkun/dayjs/issues/980)) ([231790d](https://github.com/iamkun/dayjs/commit/231790da62af0494732960c2c50d86ae9bf63ec6)), closes [#979](https://github.com/iamkun/dayjs/issues/979)
* update monthDiff function to get more accurate results ([19e8a7f](https://github.com/iamkun/dayjs/commit/19e8a7f2f7582b717f49d446822e39603694433c))
* Update UTC plugin to support keepLocalTime ([#973](https://github.com/iamkun/dayjs/issues/973)) ([9f488e5](https://github.com/iamkun/dayjs/commit/9f488e5aca92f0b4c2951459436829d79f86d8d7))
* Add Haitian Creole (ht) and Spanish Puerto Rico (es-pr) locale configs ([#958](https://github.com/iamkun/dayjs/issues/958)) ([b2642e2](https://github.com/iamkun/dayjs/commit/b2642e2d1f87734a34808c66e5176cb18bc0414d))
* Fix UTC plugin wrong hour bug while adding month or year ([#957](https://github.com/iamkun/dayjs/issues/957)) ([28ae070](https://github.com/iamkun/dayjs/commit/28ae070024ff26685c88ce4cc8747307e86923c9))
* Update French (fr) locale to set correct yearStart ([14ab808](https://github.com/iamkun/dayjs/commit/14ab808a7b7e226f2eb2cbe894916a18ed5d967d)), closes [#956](https://github.com/iamkun/dayjs/issues/956)
* Duration plugin supports parse ISO string with week (W) ([#950](https://github.com/iamkun/dayjs/issues/950)) ([f0fc12a](https://github.com/iamkun/dayjs/commit/f0fc12adadcab53fb0577ad8f5e2f1cf784fd8f5))
* LocaleData plugin supports locale order ([#938](https://github.com/iamkun/dayjs/issues/938)) ([62f429d](https://github.com/iamkun/dayjs/commit/62f429db73a0a069b1267231dea172b85f4b90e3)), closes [#936](https://github.com/iamkun/dayjs/issues/936)
* Update type definition to support array format ([#945](https://github.com/iamkun/dayjs/issues/945)) ([81d4740](https://github.com/iamkun/dayjs/commit/81d4740511d47e34f891b21afeb0449ef8a28688)), closes [#944](https://github.com/iamkun/dayjs/issues/944)
* Update type definition to support strict mode ([#951](https://github.com/iamkun/dayjs/issues/951)) ([8d54f3f](https://github.com/iamkun/dayjs/commit/8d54f3f7d4d161e72c767fa09699e70a2b3d681c))
* Add Turkmen (tk) locale ([#893](https://github.com/iamkun/dayjs/issues/893)) ([a9ca8dc](https://github.com/iamkun/dayjs/commit/a9ca8dcbbd0964c5b9abb4e8a2d620c983cf091a))
* Fix CustomParseFormat plugin set locale error ([#896](https://github.com/iamkun/dayjs/issues/896)) ([8035c8a](https://github.com/iamkun/dayjs/commit/8035c8a760549b631252252718db3cdc4ab2f68f))
* Fix locale month function bug ([#908](https://github.com/iamkun/dayjs/issues/908)) ([bf347c3](https://github.com/iamkun/dayjs/commit/bf347c36e401f50727fb5afcc537497b54b90d6b))
* Update CustomParseFormat plugin to support Array formats ([#906](https://github.com/iamkun/dayjs/issues/906)) ([97856c6](https://github.com/iamkun/dayjs/commit/97856c603ef5fbbeb1cf8a42387479e56a77dbe8))
* Fix unsupported locale fallback to previous one ([#819](https://github.com/iamkun/dayjs/issues/819)) ([4868715](https://github.com/iamkun/dayjs/commit/48687152cf5bee6a4c1b8ceea4bda8b9bab9be10))
* Set + Get accept 'D' as the short version of 'date' ([#795](https://github.com/iamkun/dayjs/issues/795)) ([523c038](https://github.com/iamkun/dayjs/commit/523c03880fa8bbad83214494ad02cd606cdb8b30))
* Update DayOfYear plugin type ([#799](https://github.com/iamkun/dayjs/issues/799)) ([5809652](https://github.com/iamkun/dayjs/commit/5809652e40245b7759827d9bf317abdcfa75a330))
* Update fi (Finnish) locale relativeTime ([#797](https://github.com/iamkun/dayjs/issues/797)) ([4a470fb](https://github.com/iamkun/dayjs/commit/4a470fbd6fef9e051727d0f26d53cc050b85935d))
* Fix weekOfYear plugin to support yearStart locale for better week number result ([#769](https://github.com/iamkun/dayjs/issues/769)) ([f00db36](https://github.com/iamkun/dayjs/commit/f00db36e70bc7beaca1abadeb30a9b1fbb3261ee))
* Update et (Estonian) locale relativeTime ([#790](https://github.com/iamkun/dayjs/issues/790)) ([d8e0f45](https://github.com/iamkun/dayjs/commit/d8e0f45f6cd2d5e5704b9797929227454c92d1a5))
* Update LocaleData plugin to support dayjs.localeData().weekdays() API ([287fed6](https://github.com/iamkun/dayjs/commit/287fed6db9eb4fd979b4861aca4dacbd32422533)), closes [#779](https://github.com/iamkun/dayjs/issues/779)
* Update LocaleData plugin to support dayjs.months dayjs.weekdays API ([144c2ae](https://github.com/iamkun/dayjs/commit/144c2ae6e15fbf89e3acd7c8cb9e237c5f6e1348)), closes [#779](https://github.com/iamkun/dayjs/issues/779)
* Add UpdateLocale plugin to update a locale's properties ([#766](https://github.com/iamkun/dayjs/issues/766)) ([82ce2ba](https://github.com/iamkun/dayjs/commit/82ce2ba8d7e402e40f6d005d400eb5356a0b0633))
* Fix CustomParseFormat Plugin 'YYYY-MM' use first day of the month ([ba709ec](https://github.com/iamkun/dayjs/commit/ba709eca86a71ae648bc68bf67d9abdc229198d4)), closes [#761](https://github.com/iamkun/dayjs/issues/761)
* Fix CustomParseFormat Plugin to set correct locale ([66ce23f](https://github.com/iamkun/dayjs/commit/66ce23f2e18c5506e8f1a7ef20d3483a4df80087))
* Update RelativeTime plugin to support function to make additional processing ([#767](https://github.com/iamkun/dayjs/issues/767)) ([4bd9250](https://github.com/iamkun/dayjs/commit/4bd9250fbe7131e2fddfb5fa1b3350e8c2262ca9))
* Update ru, uk, cs locale to support relativeTime with plural ([3f080f7](https://github.com/iamkun/dayjs/commit/3f080f7d6bfdc4018cbb7c4d0112ff1ead4ef6b8))
* Fix set utcOffset in utc mode ([d148115](https://github.com/iamkun/dayjs/commit/d148115dad8f1a5afc0a64e9b8163dfeba4616b6))
* Update advancedFormat plugin to support w ww wo week tokens … ([#678](https://github.com/iamkun/dayjs/issues/678)) ([26cfa63](https://github.com/iamkun/dayjs/commit/26cfa63a524b803f7966dac5464f9cbf8f63387e)), closes [#676](https://github.com/iamkun/dayjs/issues/676)
* Update ka locale weekdays ([f8ca3d4](https://github.com/iamkun/dayjs/commit/f8ca3d4ba1d3cbe41613d3909c0627935a51a0c4))
* Update nb locale ([#679](https://github.com/iamkun/dayjs/issues/679)) ([1063b0e](https://github.com/iamkun/dayjs/commit/1063b0e1b5c19a1354d233cc0f21438e7073233a))
* UTC plugin set utcOffset value ([#668](https://github.com/iamkun/dayjs/issues/668)) ([8877883](https://github.com/iamkun/dayjs/commit/88778838e71dd309e79cd1a8094d5bea36ca3390))
* Fix relativeTime Plugin .FromNow() result error in UTC mode ([a385d5c](https://github.com/iamkun/dayjs/commit/a385d5c))
* Handle locale in WeekOfYear plugin ([#658](https://github.com/iamkun/dayjs/issues/658)) ([0e45b0a](https://github.com/iamkun/dayjs/commit/0e45b0a))
* LocaleData plugin returns all months and weekdays data when pas no argument ([#645](https://github.com/iamkun/dayjs/issues/645)) ([95e70b4](https://github.com/iamkun/dayjs/commit/95e70b4))
* Return null in toJSON if not valid ([#633](https://github.com/iamkun/dayjs/issues/633)) ([19affc8](https://github.com/iamkun/dayjs/commit/19affc8))
* Update weekdaysShort to some locale files ([#643](https://github.com/iamkun/dayjs/issues/643)) ([cc1f15f](https://github.com/iamkun/dayjs/commit/cc1f15f))
* Fix dayjs.locale() returns current global locale ([#602](https://github.com/iamkun/dayjs/issues/602)) ([790cd1a](https://github.com/iamkun/dayjs/commit/790cd1a))
* Fix incorrect Thai locale translation of July ([#607](https://github.com/iamkun/dayjs/issues/607)) ([43cbfd3](https://github.com/iamkun/dayjs/commit/43cbfd3))
* Lowercase french locale months and weekdays ([#615](https://github.com/iamkun/dayjs/issues/615)) ([e5a257c](https://github.com/iamkun/dayjs/commit/e5a257c))
* Type - Export Ls object to query all available locales ([#623](https://github.com/iamkun/dayjs/issues/623)) ([f6bfae0](https://github.com/iamkun/dayjs/commit/f6bfae0))
* Update nb (Norsk Bokmål) locale ([#604](https://github.com/iamkun/dayjs/issues/604)) ([907f5c9](https://github.com/iamkun/dayjs/commit/907f5c9))
* Update types of `.diff` API ([#617](https://github.com/iamkun/dayjs/issues/617)) ([f0f43d2](https://github.com/iamkun/dayjs/commit/f0f43d2))
* Add missing relativeTime and formats for some locales ([#560](https://github.com/iamkun/dayjs/issues/560)) ([96b917e](https://github.com/iamkun/dayjs/commit/96b917e))
* Add weekday (locale aware day of the week) plugin ([#569](https://github.com/iamkun/dayjs/issues/569)) ([9007cc5](https://github.com/iamkun/dayjs/commit/9007cc5)), closes [#559](https://github.com/iamkun/dayjs/issues/559)
* Allow customizing "am" / "pm" strings with locale meridiem function ([#580](https://github.com/iamkun/dayjs/issues/580)) ([576e93e](https://github.com/iamkun/dayjs/commit/576e93e)), closes [#578](https://github.com/iamkun/dayjs/issues/578)
* Update Indonesian locale([#574](https://github.com/iamkun/dayjs/issues/574)) ([0aa7143](https://github.com/iamkun/dayjs/commit/0aa7143))
* Update locale month to support both array and function ([#581](https://github.com/iamkun/dayjs/issues/581)) ([b6599d3](https://github.com/iamkun/dayjs/commit/b6599d3))
* Add locale support for Azerbaijani language (az) ([#535](https://github.com/iamkun/dayjs/issues/535)) ([eeb20fa](https://github.com/iamkun/dayjs/commit/eeb20fa))
* API .locale() with no argument should return current locale name string ([8d63d88](https://github.com/iamkun/dayjs/commit/8d63d88))
* CustomParseFormat correct parse HH:mm:ss with only one digit like 0:12:10 ([600d547](https://github.com/iamkun/dayjs/commit/600d547))
* CustomParseFormat plugin parse Do format string ([bf27fda](https://github.com/iamkun/dayjs/commit/bf27fda)), closes [#522](https://github.com/iamkun/dayjs/issues/522)
* Expand setters like .year(2000) .hour(12) ([ac532a0](https://github.com/iamkun/dayjs/commit/ac532a0))
* Move toObject, toArray API to separate plugin from core ([40a3431](https://github.com/iamkun/dayjs/commit/40a3431))
* Add UTC mode with UTC plugin ([#517](https://github.com/iamkun/dayjs/issues/517)) ([caf335c](https://github.com/iamkun/dayjs/commit/caf335c))
> For plugin developers: Please note, we have changed the name of some method in `Utils` in order to reduce the file size. ([#517](https://github.com/iamkun/dayjs/issues/517)) ([detail](https://github.com/iamkun/dayjs/pull/517/files#diff-2b4ca49d4bb0a774c4d4c1672d7aa781R46))
* Word orders corrections for locale 'fa' ([#491](https://github.com/iamkun/dayjs/issues/491)) ([56050c2](https://github.com/iamkun/dayjs/commit/56050c2))
* Add Bahasa Melayu (Malaysia) locale ([#485](https://github.com/iamkun/dayjs/issues/485)) ([cb208b0](https://github.com/iamkun/dayjs/commit/cb208b0))
* Copy & export built-in en locale to /locale folder as a separate file ([a7e05e0](https://github.com/iamkun/dayjs/commit/a7e05e0))
* Fix bug in customParseFormat plugin while month(MM) is '01' ([9884ca5](https://github.com/iamkun/dayjs/commit/9884ca5)), closes [#494](https://github.com/iamkun/dayjs/issues/494)
* Fix startOf week bug while week start is not Sunday ([5eaf77b](https://github.com/iamkun/dayjs/commit/5eaf77b))
* Add missing czech language locale ([#461](https://github.com/iamkun/dayjs/issues/461)) ([7e04004](https://github.com/iamkun/dayjs/commit/7e04004))
* Add utcOffset api method and fix calculating diff error in DST ([#453](https://github.com/iamkun/dayjs/issues/453)) ([ce2e30e](https://github.com/iamkun/dayjs/commit/ce2e30e))
* Fix it locale error ([#458](https://github.com/iamkun/dayjs/issues/458)) ([f6d9a64](https://github.com/iamkun/dayjs/commit/f6d9a64))
* Add LocalizedFormat plugin supplying format like LTS, LT, LLLL
*<del>update declaration File with default export (#278)</del>
> <del>From v1.8.1, in TypeScript Project, just `import from dayjs from 'dayjs'`</del>
* add ES2015 module support (#451)
### Performance Improvements
* **format:** reuse matches instead of created when replacing ([#441](https://github.com/iamkun/dayjs/issues/441)) ([10b79d8](https://github.com/iamkun/dayjs/commit/10b79d8))
* Add relative locales to russian language ([c7e9898](https://github.com/iamkun/dayjs/commit/c7e9898)), closes [#256](https://github.com/iamkun/dayjs/issues/256)
* fix Advanced format bug in zh-cn ([0c07874](https://github.com/iamkun/dayjs/commit/0c07874)), closes [#242](https://github.com/iamkun/dayjs/issues/242)
* format API update and locale file update ([5ca48f0](https://github.com/iamkun/dayjs/commit/5ca48f0)), closes [#228](https://github.com/iamkun/dayjs/issues/228)
* Changing locales locally is immutable from this release ([2cce729](https://github.com/iamkun/dayjs/commit/2cce729)), closes [#182](https://github.com/iamkun/dayjs/issues/182)
* instance locale change should be immutable ([84597c9](https://github.com/iamkun/dayjs/commit/84597c9))